Safety Precautions

To reduce the risk of personal injury and/or damage to the fuel injection and ignition system, always observe the following:

• If engine is to be cranked at starting speed without starting, for example during a compression pressure test, disconnect the connectors from the ignition coils and the 8 pin connector for the fuel injectors -3-.
  Fig 1: Identifying Electrical Connector -2- To Knock Sensor 1

  Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
• After performing the work, check and erase the Diagnostic Trouble Code (DTC) memory. Refer to "Guided Functions" in the vehicle diagnostic tester.
• Do not touch or disconnect the ignition coils with power output stages when the engine is running or turning at starting speed.
• Only disconnect and reconnect wires for the injection and ignition system, including test leads, when the ignition is turned off.
• The battery must only be disconnected and connected with the ignition turned off, otherwise the Engine Control Module (ECM) can be damaged. Obtain the radio code for radios with a anti-theft code before disconnecting the battery.
• Follow required safety precautions after connecting the battery. Refer to Removal and Installation .

If special testing equipment is required during road test, note the following:

• Test and measuring instruments must be secured to the rear seat and operated by a second person from this location.

If test and measuring instruments are operated from the front passenger seat and the vehicle is involved in an accident, there is a possibility that the person sitting in this seat may receive serious injuries when the airbag is triggered.